JP6742893B2 - tire - Google Patents

Description

The present invention relates to a tire.

In recent years, tires using a resin material such as a thermoplastic resin or a thermoplastic elastomer have been developed in view of weight reduction and easy recycling.
For example, in Patent Document 1 below, a tire having a reinforcing cord layer (reinforcing layer) on the outer peripheral portion of an annular tire skeleton and forming the tire skeleton with a resin material, and further, a resin material for the reinforcing layer is also used. The tire used is disclosed.

JP 2012-046030 A

However, although a tire using a resin material for the tire frame body and the reinforcing layer is excellent in low loss property, etc., when the temperature of the tire becomes high due to heat generation during running, the resin material is softened, and therefore the tire becomes high temperature There is room for improvement in time durability (hereinafter, "high-speed durability").
On the other hand, in order to improve the high-speed durability of the tire, it is conceivable to use rubber (rubber surface layer) having excellent low loss property for the surface layer covering the tire surface. When the loss is reduced, the storage elastic modulus (E') of the rubber surface layer is lowered, and the distortion of the tire shoulder portion, the bead portion and their peripheral members is increased, so that the high-speed durability of the tire is sufficiently improved. I couldn't let it go.

Therefore, it is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a tire having excellent high-speed durability while using a resin material.

The gist of the present invention which solves the above problems is as follows.
<1> An annular tire frame body made of a resin composition containing 50 to 100% by mass of a resin material,
A carcass layer, which is outside in the tire radial direction of the tire frame, includes one or more carcass plies that extend in a toroidal shape between a pair of bead cores, and a carcass ply coating rubber that covers the carcass plies.
A tire radial direction outer side of the tire frame body, a reinforcing layer provided on the tire radial direction outer side or inner side of the carcass layer,
A rubber surface layer that is provided on the tire radial direction outer side of the reinforcing layer and includes at least a tread rubber,
Equipped with
The reinforcing layer is formed by coating a reinforcing member with a resin composition containing a resin material in an amount of 50 to 100% by mass,
The carcass ply coating rubber has an initial load of 160 mg, a frequency of 52 Hz, and a loss tangent tan δ at a dynamic strain of 1% at 25° C. of 0.05 to 0.2, and an initial load of 160 mg, a frequency of 52 Hz, and a dynamic temperature of 25° C. The tire has a storage elastic modulus E′ of 2 to 10 MPa at a strain of 1%.

Since the carcass ply coating rubber contained in the carcass layer supporting the tire frame has the above-mentioned characteristics, the tire has excellent high-speed durability even when the reinforcing layer is made of a resin composition containing a resin material.

<2> The carcass ply coating rubber has an initial load of 160 mg, a frequency of 52 Hz, and a loss tangent tan δ at a dynamic strain of 1% at 25° C. of 0.05 to 0.13, and an initial load of 160 mg and a frequency of 52 Hz, 25. The tire according to <1>, which has a storage elastic modulus E′ at a dynamic strain of 1% at 4° C. of 4 to 8 MPa.

Since the carcass ply coating rubber contained in the carcass layer supporting the tire frame has the above-mentioned characteristics, it is more excellent in high-speed durability of the tire.

<3> The carcass ply coating rubber is composed of a rubber composition for carcass ply coating rubber, and the rubber composition for carcass ply coating rubber is 0.1 to 5.0 parts by mass with respect to 100 parts by mass of the rubber component. The tire according to <1> or <2>, including the organic acid of.

The amount of the organic acid in the rubber composition for the carcass ply coating rubber is within the above range, which suppresses the migration of the organic acid from the carcass ply coating rubber to the resin material and can suppress the deterioration of the reinforcing layer, Superior to high speed durability of tires.

<4> The carcass ply coating rubber is composed of a rubber composition for carcass ply coating rubber, and the rubber composition for carcass ply coating rubber is 0.1 to 5.5 parts by mass with respect to 100 parts by mass of the rubber component. The tire according to any one of <1> to <3>, including the vulcanization accelerator.

When the amount of the vulcanization accelerator in the rubber composition for carcass ply coating rubber is within the above range, the migration of the vulcanization accelerator from the carcass ply coating rubber to the resin material is suppressed, and the deterioration of the reinforcing layer is suppressed. And is superior to the high-speed durability of the tire.

<5> The tire according to any one of <1> to <4>, in which the reinforcing member is wound in the tire circumferential direction.

Since the reinforcing member is wound in the tire circumferential direction, the puncture resistance, cut resistance, and circumferential rigidity of the tire are improved, and the circumferential rigidity is improved to prevent creep of the tire frame body. It can be suppressed.

<6> The tire according to any one of <1> to <5>, in which the resin composition used for at least one of the reinforcing layer and the tire frame body contains at least one of a thermoplastic resin and a thermoplastic elastomer. is there.

When the resin composition contains at least one of the thermoplastic resin and the thermoplastic elastomer, the weight of the tire can be further reduced, and the tire can be more easily recycled.

<7> The tire according to <6>, wherein at least one of the thermoplastic resin and the thermoplastic elastomer is a polyamide system, a polyester system, a polyolefin system, or a polyurethane system.

When at least one of the thermoplastic resin and the thermoplastic elastomer is a polyamide type, a polyester type, a polyolefin type, or a polyurethane type, it becomes easier to recycle the reinforcing layer and/or the tire frame body.

According to the present invention, it is possible to provide a tire having excellent high-speed durability while using a resin material.

It is a sectional view of one embodiment of the tire of the present invention. It is an enlarged view which expanded a part of sectional view of one embodiment of the tire of the present invention.

Hereinafter, the tire of the present invention will be described in detail with reference to the embodiment.
FIG. 1 is a cross-sectional view of an embodiment of the tire of the present invention. Further, FIG. 2 shows an enlarged view in which a part of FIG. 1 is enlarged. The reference numerals in FIG. 2 are the same as the reference numerals in FIG. Hereinafter, description will be made mainly with reference to FIG.
The tire shown in FIG. 1 includes a tire frame body 10, a reinforcing layer 20 provided on the tire radial direction outer side of the tire frame body 10, a tire radial direction outer side of the reinforcing layer 20, a tread rubber 32, and a side rubber. And a rubber surface layer 30 including a gum chafer 36.

The tire frame body 10 of the tire illustrated in FIG. 1 is formed in an annular shape, and in a cross section in the tire width direction thereof, a pair of bead portions 11 and a pair of side portions 12 continuous to the tire radial direction outer side of the bead portions 11. And a crown portion 13 that is continuous to the tire width direction inner side of the side portion 12 and connects the tire radial direction outer ends of each side portion 12, and the reinforcing layer 20 is provided on the tire radial direction outer side of the crown portion 13. It is provided. The tire frame body 10 is made of a resin composition containing a resin material in an amount of 50 to 100% by mass. Here, when simply expressed as “resin”, the “resin” is a concept including a thermoplastic resin, a thermoplastic elastomer, and a thermosetting resin, and does not include a vulcanized rubber. The same applies to the resin composition forming the coating layer 22 described later. When the tire frame body 10 is made of the resin composition, the weight of the tire can be reduced, and the tire can be easily recycled.
An annular bead core 14 similar to a general tire is embedded in the bead portion 11, and a steel cord or the like can be used for the bead core 14.

The tire reinforcing layer 20 shown in FIGS. 1 and 2 includes a reinforcing member 21 and a coating layer 22 that covers the reinforcing member 21. Here, for the coating layer 22 of the reinforcing layer 20, a resin composition containing 50 to 100 mass% of a resin material is used. The resin composition used for the coating layer 22 and the resin composition used for the tire frame body 10 may be the same or different.
The reinforcing member 21 is preferably wound in the tire circumferential direction. Since the reinforcing member 21 is wound in the tire circumferential direction, the puncture resistance, cut resistance, and circumferential rigidity of the tire are improved, and the circumferential rigidity is improved, so that creep of the tire frame body is caused. Can also be suppressed.

A carcass ply extending in a toroidal shape between the pair of bead cores 14 and a carcass covering the carcass ply, which is outside the tire frame body 10 in the tire radial direction and between the tire frame body 10 and the rubber surface layer 30. It has a carcass layer 40 containing ply coating rubber.
1 and 2, the carcass layer 40 includes a carcass layer 40a and a carcass layer 40b that overlap each other in a band including a tire equator (a line that is perpendicular to an axis of rotation of the tire and passes through the center of the tire tread). However, the carcass layer 40 may be composed of one continuous layer.

Further, the carcass layer 40 may be arranged inside the tire frame body 10 in the tire radial direction, between the tire frame body 10 and the reinforcing layer 20, or outside the tire frame body 10 and the reinforcing layer 20 in the tire radial direction. From the viewpoint of ease of manufacture and protection of the tire frame body 10 from external damage, the tire frame body 10 and the reinforcing layer 20 are preferably arranged on the outer side in the tire radial direction.
Hereinafter, description will be made by omitting the reference numerals.

<Rubber surface layer>
The rubber surface layer is provided outside the reinforcing layer in the tire radial direction and includes at least tread rubber. The rubber surface layer may further include a side rubber and a gum chafer.
The tread rubber, side rubber and gum chafer, and carcass ply coating rubber are all vulcanized rubbers. The rubber composition that constitutes the carcass ply coating rubber before vulcanization is referred to as a rubber composition for carcass ply coating rubber. That is, the rubber obtained by vulcanizing the rubber composition for carcass ply coating rubber is the carcass ply coating rubber. The same applies to tread rubber, side rubber and gum chafer.
Unless otherwise specified, "rubber" means vulcanized rubber, and the rubber composition is in an unvulcanized or semi-vulcanized state. Here, vulcanized means a state where the vulcanization degree required for the final product is reached, and semi-vulcanized state has a higher vulcanization degree than the unvulcanized state, but as a final product It means a state where the required degree of vulcanization has not been reached.

<Carcass layer>
As described with reference to FIG. 1, the carcass layer covers one or more carcass plies extending outside in a tire radial direction of the tire frame body in a toroidal shape between a pair of bead cores, and the carcass ply. Includes carcass ply coating rubber.
The carcass ply coating rubber has a loss tangent tan δ of 0.05 to 0.2 when the initial load is 160 mg, the frequency is 52 Hz, and the dynamic strain is 1% at 25° C., and the initial strain is 160 mg, the frequency is 52 Hz, and the dynamic strain is 25° C. The storage elastic modulus E′ at 1% is 2 to 10 MPa.
Hereinafter, when simply referred to as “tan δ” and “E′”, “initial load 160 mg, frequency 52 Hz, loss tangent tan δ at 1% dynamic strain at 25° C.” and “initial load 160 mg, frequency 52 Hz, at 25° C. It indicates the storage elastic modulus E'" when the dynamic strain is 1%.
By using the carcass layer in which the carcass ply is coated with the carcass ply coating rubber having tan δ of 0.05 to 0.2 and E′ of 2 to 10 MPa, the tire using the resin material as the reinforcing layer is High speed durability can be improved.

The tire frame body has a basic shape of the tire, and the reinforcing layer plays a role of improving circumferential rigidity of the tire frame body. In the present invention, a resin composition containing a resin material in an amount of 50 to 100% by mass is used for the tire frame body and the reinforcing layer. By using a resin material for the tire skeleton body and the reinforcing layer, the tire is lighter in weight and excellent in low loss and the like as compared with the conventional rubber tire. On the other hand, when the tire rotates at a high speed and the temperature of the tire becomes high due to friction between the tire and the road surface, the resin material is softened, so that the high-speed durability is easily lowered. In order to improve the high speed durability of the tire, a means of applying a low loss rubber having a low tan δ to the carcass ply coating rubber and applying a carcass ply coated with the carcass ply with the carcass ply coating rubber is considered. However, if the low loss rubber is simply applied to the carcass ply coating rubber, the storage elastic modulus (E') of the carcass ply coating rubber is also lowered and the strain becomes large, so that sufficient high speed durability cannot be maintained. ..
On the other hand, when the carcass ply coated with the carcass ply coating rubber having tan δ and E′ in the above range is used, heat generation is suppressed and softening of the resin material contained in the reinforcing layer can be suppressed. .. As a result, it is considered that the tire has excellent high-speed durability.

If the tan δ of the carcass ply coating rubber is not less than 0.2, heat generation of the tire cannot be suppressed. By lowering the tan δ of the carcass ply coating rubber, it is easy to reduce the loss, but if the loss is simply reduced, the E'of the carcass ply coating rubber will decrease and the E'of the carcass layer that should protect the tire rigidity will decrease. Then, since the distortion of the carcass ply coating rubber becomes large, the high speed durability of the tire cannot be sufficiently improved. Therefore, tan δ of the carcass ply coating rubber is 0.5 or more, and E′ of the carcass ply coating rubber is 2 MPa or more. On the other hand, when E'of the carcass ply coating rubber exceeds 10 MPa, the carcass layer becomes rigid and a load is applied to the rubber surface layer including the tire frame body, the reinforcing layer, the tread rubber, etc., and the durability of the tire is impaired.
The tan δ of the carcass ply coating rubber is preferably 0.06 to 0.13, and E′ is preferably 4 to 8 MPa.

As the cord used for producing the fiber cord constituting the carcass ply coated with the carcass ply coating rubber, a cord using a single organic fiber such as polyamide fiber, polyester fiber, rayon fiber, or aramid fiber, a plurality of organic fibers Examples include mixed twisted cords and twisted twisted cords, steel cords, and the like. Among the above, from the viewpoint of tire durability, a cord obtained by mixing or twisting a plurality of organic fibers or a steel cord is preferable.
The cord can be made by twisting filament bundles together. The number of filament bundles to be twisted is not particularly limited, and a cord obtained by twisting two or three filament bundles is usually used. The number of reinforcing fiber cords forming the carcass ply is not particularly limited and may be, for example, 30 to 60/50 mm.

By fiberizing the carcass ply having the above fiber cord, a fiber cord/rubber composite can be obtained, and a carcass layer including the carcass ply coated with the carcass ply coating rubber can be obtained.
Prior to rubberizing the fiber cord, an adhesive may be applied to the fiber cord to improve the adhesiveness between the fiber cord and the carcass ply coating rubber.

The carcass ply coating rubber is a rubber composition (rubber composition for carcass ply coating rubber) in which the types or blending ratios of rubber components and the types or amounts of compounding agents are adjusted so that the above tan δ and E′ numerical ranges are satisfied. ) Can be used. Similarly, tread rubber, side rubber, and gum chafer also use a rubber composition in which the type or blending ratio of rubber components and the type or amount of compounding agent are adjusted so that they have characteristics according to their respective functions. be able to.

[Rubber component]
Here, as the rubber component, in addition to natural rubber (NR), synthetic isoprene rubber (IR), polybutadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), styrene-isoprene copolymer rubber (SIR) Synthetic diene rubbers such as the above can be used, and other synthetic rubbers can also be used. These rubber components may be used alone or as a blend of two or more.
Particularly, in the rubber composition for carcass ply coating rubber, natural rubber and styrene-butadiene copolymer rubber (SBR) are preferable as the rubber component. From the viewpoint of improving the crack resistance from the cord end of the carcass ply, it is more preferable to use natural rubber as the main component. Specifically, the natural rubber content in the rubber component is preferably more than 50% by mass, more preferably 60% by mass or more, and even more preferably 65% by mass or more.

〔filler〕
Examples of the filler include carbon black and silica.
The filler is preferably contained in various rubber compositions in an amount of 25 to 60 parts by mass with respect to 100 parts by mass of the rubber component. When the content of the filler is 25 parts by mass or more, sufficient crack resistance can be obtained and the durability of the tire can be enhanced. Further, when the amount is 60 parts by mass or less, the tire can be prevented from becoming brittle and the durability can be prevented from being deteriorated. From the same viewpoint, it is more preferably 30 to 50 parts by mass with respect to 100 parts by mass of the rubber component.

(Carbon black)
Examples of carbon black used in the rubber composition for carcass ply coating rubber include HAF (nitrogen adsorption specific surface area: 75 to 80 m ² /g), HS-HAF (nitrogen adsorption specific surface area: 78 to 83 m ² /g), LS-HAF (nitrogen adsorption specific surface area: 80 to 85 m ² /g), FEF (nitrogen adsorption specific surface area: 40 to 42 m ² /g), GPF (nitrogen adsorption specific surface area: 26 to 28 m ² /g), N339 (nitrogen) Adsorption specific surface area: 88 to 96 m ² /g), LI-HAF (nitrogen adsorption specific surface area: 73 to 75 m ² /g), IISAF (nitrogen adsorption specific surface area: 97 to 98 m ² /g), HS-IISAF (nitrogen adsorption) Specific surface area: 98 to 99 m ² /g) and the like.
Of these, HAF (nitrogen adsorption specific surface ^{area: 75~80m 2 / g), HS} -HAF ( nitrogen adsorption specific surface ^{area: 78~83m 2 / g), LS} -HAF ( nitrogen adsorption specific surface area: 80~85m ² / g), FEF (nitrogen adsorption specific surface area: 40 to 42 m ² /g), and LI-HAF (nitrogen adsorption specific surface area: 73 to 75 m ² /g) are preferable.
These carbon blacks may be used alone or in combination of two or more.

(silica)
In addition to carbon black, silica may be blended into the rubber composition for carcass ply coating rubber, if desired. Silica may be contained in an amount of 10 parts by mass or less based on 100 parts by mass of the rubber component of the rubber composition for carcass ply coating rubber.
As silica, wet silica, dry silica and colloidal silica are preferably used, and wet silica is particularly preferably used. The BET specific surface area (measured in accordance with ISO 5794/1) of silica is preferably 40 to 350 m ² /g. Silica having a BET surface area within this range is advantageous in that it can achieve both rubber-reinforcing properties and dispersibility in rubber components. In this respect, BET surface area is more preferably silica in the range of 80~350m ² / g, silica BET surface area in the range of 120~350m ² / g is particularly preferred. Such a Tosoh Silica Co., Ltd. as silica, trade name "Nipsil AQ" (BET specific surface area = 220m ² / g), "Nipsil KQ", Degussa Corporation, trade name "Ultra Jill VN3" (BET specific surface area = 175m ² Commercially available products such as /g) can be used.

[Vulcanizing agent]
Examples of the vulcanizing agent include sulfur.
In the rubber composition for carcass ply coating rubber, since the adhesion between the carcass ply coating rubber and the cord of the carcass ply is required, the rubber composition for the tread rubber, the rubber composition for the side rubber, etc. Also tends to use more vulcanizing agents.
Specifically, the vulcanizing agent is preferably contained in the rubber composition for carcass ply coating rubber in an amount of 0.1 to 10 parts by mass based on 100 parts by mass of the rubber component. When the content of the vulcanizing agent is 0.1 parts by mass or more, it can be sufficiently vulcanized, and when it is 10 parts by mass or less, the overvulcanized state can be prevented, and the rubber composition can be prevented from becoming hard and brittle. .. From the above viewpoint, the vulcanizing agent is more preferably 1.3 to 7.0 parts by mass, further preferably 2.3 to 5.0 parts by mass. When the compounding amount of the vulcanizing agent is 7.0 parts by mass or less, deterioration of aging resistance of the rubber composition can be prevented. Further, if the vulcanizing agent is blended in an amount of 3.0 parts by mass or more, the initial adhesiveness can be improved, which is more preferable.

The compounding agent used in the rubber composition is a compounding agent usually used in the rubber industry, for example, the above-mentioned filler and vulcanizing agent, an organic acid, a softening agent, an antioxidant, and zinc oxide. (Zinc white), a vulcanization accelerator and the like.
Examples of organic acids include carboxylic acids such as stearic acid.
Examples of the softening agent include mineral-derived mineral oil, petroleum-derived aromatic oil, paraffin oil, naphthene oil, and natural-derived palm oil.
As the vulcanization accelerator, 2-mercaptobenzothiazole (M), dibenzothiazolyl disulfide (DM), N-cyclohexyl-2-benzothiazolyl sulfenamide (CZ), N-tert-butyl-2-benzo. Examples thereof include thiazole vulcanization accelerators such as thiazolyl sulfenamide (NS) and guanidine vulcanization accelerators such as 1,3-diphenylguanidine (DPG).
Since the carcass layer is not exposed to the tire surface, it does not need to contain an antioxidant for ozone deterioration. Specifically, the compounding amount of the antioxidant for ozone deterioration in the rubber composition for carcass ply coating rubber is It can be less than 0.1 parts by mass with respect to 100 parts by mass of the component.

The rubber composition can be produced by, for example, using a Banbury mixer, a roll or the like, mixing the rubber component with various compounding agents appropriately selected as necessary, kneading the mixture, and then heating and extruding. it can. A tread rubber, a side rubber and a gum chafer, and a carcass ply coating rubber can be produced by molding the rubber composition into a desired shape and vulcanizing it. Vulcanization of each rubber composition is performed by, for example, a tire skeleton body and a reinforcing layer, a carcass ply coated with a rubber composition for carcass ply coating rubber, a rubber composition for tread rubber, a rubber composition for side rubber, and a chain. The rubber composition for fur can be formed after molding an unvulcanized tire arranged at the position shown in FIG. Further, even if a carcass ply having a fiber cord is rubberized to assemble a carcass layer composed of a fiber cord/rubber composite, a vulcanized rubber surface layer, a tire skeleton body, and a reinforcing layer. Good.

[Organic acid]
The carcass ply coating rubber comprises a rubber composition for a carcass ply coating rubber, and the rubber composition for a carcass ply coating rubber contains 0.1 to 5.0 parts by mass of an organic acid with respect to 100 parts by mass of a rubber component. It is preferable.
From the viewpoint of accelerating the vulcanization of the rubber composition, the rubber composition for carcass ply coating rubber usually contains 0.1 part by mass or more of an organic acid based on 100 parts by mass of the rubber component. Organic acids tend to remain inside. Since the organic acid is usually a low-molecular carboxylic acid represented by stearic acid, if the amount of the organic acid in the carcass ply coating rubber is large, the organic acid may exude from the carcass ply coating rubber. When the amount of the organic acid in the rubber composition for a carcass ply coating rubber is 5.0 parts by mass or less with respect to 100 parts by mass of the rubber component, it is possible to suppress the exudation of the organic acid from the carcass ply coating rubber. Therefore, the deterioration of the resin material due to the organic acid exuded from the carcass ply coating rubber can be suppressed, and the high speed durability of the tire can be further improved.

The amount of organic acid in the rubber composition for carcass ply coating rubber is more preferably 0.5 parts by mass or more based on 100 parts by mass of the rubber component. When the amount of the organic acid in the rubber composition for carcass ply coating rubber is 0.5 parts by mass or more based on 100 parts by mass of the rubber component, the vulcanized state of the carcass ply coating rubber is higher and the durability of the tire is improved. It can be said that it is excellent.
The organic acid in the rubber composition is contained in, for example, stearic acid as the above-mentioned compounding agent, and also in natural rubber or the like that can be used as a rubber component.

[Vulcanization accelerator]
The carcass ply coating rubber comprises a rubber composition for carcass ply coating rubber, and the rubber composition for carcass ply coating rubber contains 0.1 to 5.5 parts by mass of a vulcanization accelerator with respect to 100 parts by mass of a rubber component. It is preferable to include.
From the viewpoint of accelerating vulcanization of the rubber composition, the rubber composition for carcass ply coating rubber usually contains 0.1 part by mass or more of a vulcanization accelerator with respect to 100 parts by mass. The vulcanization accelerator usually remains in the inside. As already mentioned, as the vulcanization accelerator, a low molecular weight compound represented by 1,3-diphenylguanidine is usually used. Therefore, when the amount of the vulcanization accelerator in the carcass ply coating rubber is large, The vulcanization accelerator may exude from the coated rubber. The amount of the vulcanization accelerator in the rubber composition for carcass ply coating rubber is 5.5 parts by mass or less with respect to 100 parts by mass of the rubber component, so that the vulcanization accelerator exudes from the carcass ply coating rubber. The deterioration of the resin material due to the vulcanization accelerator exuded from the carcass ply coating rubber can be suppressed, and the high speed durability of the tire can be further improved.

The amount of the vulcanization accelerator in the rubber composition for carcass ply coating rubber is preferably 1.0 to 5.0 parts by mass with respect to 100 parts by mass of the rubber component. When the amount of the vulcanization accelerator in the rubber composition for carcass ply coating rubber is 1.0 part by mass or more relative to 100 parts by mass of the rubber component, the vulcanized state of the carcass ply coating rubber is higher and the tire durability It can be said that it is excellent in sex. When the amount of the vulcanization accelerator in the rubber composition for carcass ply coating rubber is 5.0 parts by mass or less relative to 100 parts by mass of the rubber component, the amount of the vulcanization accelerator exuded from the carcass ply coating rubber is Since the amount can be further reduced, the deterioration of the resin material can be further suppressed, and the high speed durability of the tire can be further improved.

A resin may be mixed with the carcass ply coating rubber. As the resin, those usually blended in the tire rubber composition can be appropriately used, and examples thereof include a phenol resin. Examples of the phenol resin include novolac type phenol resin and the like. Further, as a curing agent for the resin, for example, hexamethoxymethylmelamine (HMMM) or the like can be blended. In the present invention, the resin is mainly used for the purpose of controlling E′ and tan δ of the rubber composition, and the compounding amount of the resin can be appropriately adjusted to achieve desired performance.

<Reinforcing layer>
The reinforcing layer is composed of a reinforcing member and a coating layer coated with a resin composition containing a resin material in an amount of 50 to 100% by mass. The reinforcing layer may be used in combination with another reinforcing member, for example, a two-layer cross belt member, but from the viewpoint of weight reduction, it is preferably used alone.
The reinforcing layer can be produced, for example, by coating the reinforcing member with the resin composition and disposing the reinforcing member covered with the resin composition on the tire radial direction outer side of the tire frame body.

Examples of the reinforcing member used for the reinforcing layer include steel cords, organic fiber cords, carbon fiber cords, and the like. Among these, steel cords are preferable because they have an excellent effect of improving the circumferential rigidity of the tire.

[Resin composition]
A resin composition containing a resin material in an amount of 50 to 100% by mass is used for the coating layer of the reinforcing layer. In the resin composition used for the reinforcing layer, when the content of the resin material is 50% by mass or more, the effect of reducing the weight of the tire becomes large, and the tire can be easily recycled. When the reinforcing member is coated with rubber, it is difficult to separate the reinforcing member and the rubber only by heating, but if the coating layer uses a resin composition containing 50 to 100% by mass of the resin material, only heating is required. The reinforcing member and the coating layer can be separated, which is advantageous in recycling the tire. Here, from the viewpoint of ease of recycling, the resin composition used for the coating layer of the reinforcing layer preferably contains the resin material in an amount of 60 to 100% by mass, more preferably 70 to 100% by mass. Further, if it is a coating layer using a resin composition containing a resin material in an amount of 50 to 100% by mass, the reinforcing member can be made hard and the high speed durability of the tire can be further improved.
The reinforcing layer of the tire of the present invention is formed by coating the reinforcing member with a resin composition containing 50 to 100% by mass of a resin material, and is different from a carcass layer obtained by coating the reinforcing member with rubber.
Here, the resin material does not include rubber, and examples of the resin material include a thermoplastic resin, a thermoplastic elastomer, and a thermosetting resin.

The resin composition used for the reinforcing layer preferably contains at least one of a thermoplastic resin and a thermoplastic elastomer, and more preferably contains a thermoplastic elastomer. By forming the reinforcing layer using the thermoplastic resin and/or the thermoplastic elastomer, it becomes easier to recycle the reinforcing layer. Further, by forming the reinforcing layer using the thermoplastic elastomer, the durability of the reinforcing layer against strain input is improved.
Here, the thermoplastic resin and the thermoplastic elastomer are polymer compounds in which the material softens and flows as the temperature rises and becomes relatively hard and strong when cooled, and in this specification, among them, as the temperature rises. When a material softens, flows, and cools, it becomes a relatively hard and strong state, and a polymer compound with rubber-like elasticity is used as a thermoplastic elastomer. When the material rises in temperature, the material softens and flows, and when cooled, it becomes relatively hard and strong. A polymer compound that is in a certain state and does not have rubber-like elasticity is distinguished as a thermoplastic resin.

[Thermoplastic resin]
Examples of the thermoplastic resin include a polyolefin-based thermoplastic resin, a polystyrene-based thermoplastic resin, a polyamide-based thermoplastic resin, a polyester-based thermoplastic resin, and a polyurethane-based thermoplastic resin.
From the viewpoint of facilitating recycling of the reinforcing layer, at least one of the thermoplastic resin and the thermoplastic elastomer contained in the resin composition is preferably a polyamide type, a polyester type, a polyolefin type or a polyurethane type. That is, the thermoplastic resin is preferably a polyamide-based thermoplastic resin, a polyester-based thermoplastic resin, a polyolefin-based thermoplastic resin, or a polyurethane-based thermoplastic resin.
Among these, polyamide-based thermoplastic resins, polyester-based thermoplastic resins, and polyurethane-based thermoplastic resins are preferable from the viewpoint of durability against strain input.

[Thermoplastic elastomer]
As the thermoplastic elastomer, a polyolefin thermoplastic elastomer (TPO), a polystyrene thermoplastic elastomer (TPS), a polyamide thermoplastic elastomer (TPA), a polyurethane thermoplastic elastomer (TPU), a polyester thermoplastic elastomer (TPC). , Dynamically crosslinkable thermoplastic elastomer (TPV) and the like.
As described above, from the viewpoint of facilitating recycling of the reinforcing layer, at least one of the thermoplastic resin and the thermoplastic elastomer contained in the resin composition may be a polyamide-based, polyester-based, polyolefin-based or polyurethane-based. preferable. That is, the thermoplastic elastomer is preferably a polyamide-based thermoplastic elastomer (TPA), a polyester-based thermoplastic elastomer (TPS), a polyolefin-based thermoplastic elastomer (TPO), or a polyurethane-based thermoplastic elastomer (TPU).
Among these, from the viewpoint of durability against strain input, a polyamide thermoplastic elastomer (TPA), a polyurethane thermoplastic elastomer (TPU), and a polyester thermoplastic elastomer (TPC) are preferable.

The thermoplastic resin and the thermoplastic elastomer may be used alone or in a combination of two or more kinds. The melting point (or softening point) of the resin material itself is usually 100°C to 350°C, preferably about 100°C to 250°C, but 120°C to 250 from the viewpoint of achieving both tire productivity and durability. The temperature is preferably about 0°C, more preferably 120°C to 200°C. By using a material whose melting point (or softening point) is within the above temperature range, it is possible to ensure suitable productivity.

(Polyamide thermoplastic elastomer)
The thermoplastic polyamide-based elastomer (TPA) is a polymer compound having elasticity, and includes a polymer that constitutes a crystalline hard segment having a high melting point and a polymer that constitutes an amorphous soft segment having a low glass transition temperature. It means a thermoplastic resin material composed of a copolymer having a amide bond (—CONH—) in the main chain of the polymer constituting the hard segment.
As the polyamide-based thermoplastic elastomer, at least polyamide constitutes a hard segment having a crystalline and high melting point, and another polymer (for example, polyester, polyether etc.) constitutes an amorphous and a soft segment having a low glass transition temperature. The materials are listed. In addition to the hard segment and the soft segment, a chain extender such as dicarboxylic acid may be used in the polyamide-based thermoplastic elastomer.

Examples of the polyamide forming the hard segment of the thermoplastic polyamide-based elastomer (TPA) include polycondensates of ω-aminocarboxylic acid and lactam, and copolycondensates of diamine and dicarboxylic acid.
Examples of the ω-aminocarboxylic acid include 6-aminocaproic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 10-aminocapric acid, 11-aminoundecanoic acid and 12-aminododecanoic acid.
Examples of the lactam include lauryl lactam, ε-caprolactam, ω-enanthlactam and 2-pyrrolidone.
As the diamine, ethylenediamine, trimethylenediamine, tetramethylenediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, nonamethylenediamine, decamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4-trimethyl. Hexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, 3-methylpentamethylenediamine, metaxylenediamine and the like can be mentioned.
Examples of the dicarboxylic acid include oxalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid and dodecanedioic acid.

As the polymer forming the soft segment of the polyamide-based thermoplastic elastomer (TPA), polyester, polyether such as polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, or ABA type triblock polyether, or a modified diamine is used. Can be mentioned.

Examples of the combination of the hard segment and the soft segment of the thermoplastic polyamide elastomer (TPA) include a lauryl lactam ring-opening polycondensate/polyethylene glycol combination, a lauryl lactam ring-opening polycondensate/polypropylene glycol combination, and a lauryl lactam. Of the ring-opening polycondensate/polytetramethylene ether glycol, a combination of the ring-opening polycondensate of lauryl lactam/the ABA type triblock polyether, and the ring-opening polycondensate of lauryl lactam/the ABA type triblock poly are preferred. A combination of ethers is particularly preferred.

The thermoplastic polyamide-based elastomer can be synthesized by copolymerizing a polymer forming a hard segment and a polymer forming a soft segment by a known method. As the polyamide-based thermoplastic elastomer, commercially available products can be used, for example, "UBESTA XPA" series manufactured by Ube Industries, Ltd. (for example, XPA9063X1, XPA9055X1, XPA9048X2, XPA9048X1, XPA9040X1, XPA9040X2, XPA9044, etc.). , "Vestamide" series manufactured by Daicel Eponic Co., Ltd. (for example, E40-S3, E47-S1, E47-S3, E55-S1, E55-S3, EX9200, E50-R2) and the like.

(Polyolefin thermoplastic elastomer)
In the thermoplastic polyolefin elastomer (TPO), at least polyolefin constitutes a hard segment having a crystalline and high melting point, and another polymer (for example, polyolefin or another polyolefin) comprises a soft segment having an amorphous and low glass transition temperature. The constituent materials may be mentioned. Examples of the polyolefin forming the hard segment include polyethylene, polypropylene, isotactic polypropylene, polybutene and the like.

The thermoplastic polyolefin-based elastomer is not particularly limited, but a crystalline polyolefin constitutes a hard segment having a high melting point, and an amorphous polymer constitutes a soft segment having a low glass transition temperature. Polymers may be mentioned.
Examples of the polyolefin-based thermoplastic elastomer include olefin-α-olefin random copolymers and olefin block copolymers. For example, propylene block copolymers, ethylene-propylene copolymers, propylene-1-hexene copolymers. Copolymer, propylene-4-methyl-1 pentene copolymer, propylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-4-methyl-pentene copolymer, ethylene-1-butene copolymer Coal, 1-butene-1-hexene copolymer, 1-butene-4-methyl-pentene, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene -Butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, propylene-methacrylic acid copolymer, propylene-methyl methacrylate copolymer, propylene -Ethyl methacrylate copolymer, propylene-butyl methacrylate copolymer, propylene-methyl acrylate copolymer, propylene-ethyl acrylate copolymer, propylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer, propylene -Vinyl acetate copolymer and the like can be mentioned.

As the polyolefin-based thermoplastic elastomer, propylene block copolymer, ethylene-propylene copolymer, propylene-1-hexene copolymer, propylene-4-methyl-1pentene copolymer, propylene-1-butene copolymer , Ethylene-1-hexene copolymer, ethylene-4-methyl-pentene copolymer, ethylene-1-butene copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-methacryl Ethyl acid copolymer, ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, propylene-methacrylic acid copolymer, propylene-methacryl Methyl acid copolymer, propylene-ethyl methacrylate copolymer, propylene-butyl methacrylate copolymer, propylene-methyl acrylate copolymer, propylene-ethyl acrylate copolymer, propylene-butyl acrylate copolymer, ethylene- Vinyl acetate copolymer, propylene-vinyl acetate copolymer is preferable, ethylene-propylene copolymer, propylene-1-butene copolymer, ethylene-1-butene copolymer, ethylene-methyl methacrylate copolymer, Ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer are more preferable.
Further, two or more kinds of polyolefin resins such as ethylene and propylene may be used in combination. The polyolefin content in the thermoplastic polyolefin-based elastomer is preferably 50% by mass or more and 100% by mass or less.

The number average molecular weight of the thermoplastic polyolefin-based elastomer is preferably 5,000 to 10,000,000. When the thermoplastic polyolefin elastomer has a number average molecular weight of 5,000 to 10,000,000, the resin material has sufficient mechanical properties and excellent processability. From the same viewpoint, it is more preferably 7,000 to 1,000,000, and particularly preferably 10,000 to 1,000,000. Thereby, the mechanical properties and workability of the resin material can be further improved. The number average molecular weight of the polymer constituting the soft segment is preferably 200 to 6000 from the viewpoint of toughness and low temperature flexibility. Further, the mass ratio (x:y) of the hard segment (x) and the soft segment (y) is preferably 50:50 to 95:5, and more preferably 50:50 to 90:10 from the viewpoint of moldability.

The thermoplastic polyolefin-based elastomer can be synthesized by copolymerizing a polymer forming a hard segment and a polymer forming a soft segment by a known method.
As the polyolefin-based thermoplastic elastomer, commercially available products can be used. For example, "Toughmer" series manufactured by Mitsui Chemicals, "Nucrel" series, "Elvalloy AC" series, Sumitomo Mitsui DuPont Polychemical Co., Ltd. Chemicals "Aklift" series, "Evatate" series, Tosoh Corporation "Ultrasen" series, Prime Polymer "Prime TPO" series, etc. can be used.

(Polyurethane thermoplastic elastomer)
As a thermoplastic polyurethane elastomer (TPU), at least polyurethane forms pseudo-crosslinks by physical aggregation to form hard segments, and other polymers form amorphous soft segments having a low glass transition temperature. Ingredients are listed.

The soft segment of the thermoplastic polyurethane elastomer (TPU) includes polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, poly(butylene adipate) diol, poly-ε-caprolactone diol, poly(hexamethylene carbonate) diol, and the like. Polymer diol compound, 1,2-ethylene diisocyanate, 1,3-propylene diisocyanate, 1,4-butane diisocyanate, 1,6-hexamethylene diisocyanate, 1,4-cyclohexane diisocyanate, 4,4-cyclohexane diisocyanate, 4 , 4'-diphenylmethane diisocyanate, tolylene diisocyanate and other diisocyanate compounds can be used.

The hard segment of the thermoplastic polyurethane elastomer (TPU) includes ethylene glycol, propylene glycol, trimethylene glycol, 1,4-butanediol, 1,3-butanediol, 1,5-pentanediol and 1,6. -Hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, cyclopentane-1,2-diol, cyclohexane-1,2-diol, cyclohexane -1,3-diol, cyclohexane-1,4-diol, cyclohexane-1,4-dimethanol, hydroquinone, resorcin, chlorohydroquinone, bromohydroquinone, methylhydroquinone, phenylhydroquinone, methoxyhydroquinone, phenoxyhydroquinone, 4,4'. -Dihydroxybiphenyl, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxybenzophenone, 4,4'-dihydroxydiphenylmethane, bisphenol A, 1 1,2-di(4-hydroxyphenyl)cyclohexane, 1,2-bis(4-hydroxyphenoxy)ethane, 1,4-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, and other low-molecular diol compounds; Ethylene diisocyanate, 1,3-propylene diisocyanate, 1,4-butane diisocyanate, 1,6-hexamethylene diisocyanate, 1,4-cyclohexane diisocyanate, 4,4-cyclohexane diisocyanate, 4,4′-diphenylmethane diisocyanate, tolylene diisocyanate And a diisocyanate compound such as.

The thermoplastic polyurethane-based elastomer can be synthesized by copolymerizing a polymer forming a hard segment and a polymer forming a soft segment by a known method. As the polyurethane-based thermoplastic elastomer, commercially available products can be used. For example, "Elastollan" series manufactured by BASF (for example, ET680, ET880, ET690, ET890, etc.), and "Kuramiron manufactured by Kuraray Co., Ltd." "U" series (for example, 2000 series, 3000 series, 8000 series, 9000 series), "Miractran" series (for example, XN-2001, XN-2004, P390RSUP, P480RSUI, P26MRNAT, E490, E590, manufactured by Nippon Miractolan Co., Ltd. P890) and the like.

(Polyester thermoplastic elastomer)
The polyester-based thermoplastic elastomer (TPC) is a polymer compound having elasticity, and includes a polymer that constitutes a crystalline hard segment having a high melting point, a polymer that constitutes an amorphous soft segment having a low glass transition temperature, Which is a thermoplastic resin material comprising a copolymer having: a polyester resin as a polymer constituting a hard segment.

An aromatic polyester can be used as the crystalline polyester forming the hard segment of the polyester-based thermoplastic elastomer (TPC). The aromatic polyester can be formed, for example, from an aromatic dicarboxylic acid or its ester-forming derivative and an aliphatic diol. Examples of the aromatic polyester forming the hard segment include polyethylene terephthalate, polybutylene terephthalate, polystyrene terephthalate, polyethylene naphthalate and polybutylene naphthalate, and polybutylene terephthalate is preferable.
One of the suitable aromatic polyesters forming the hard segment includes terephthalic acid and/or polybutylene terephthalate derived from dimethyl terephthalate and 1,4-butanediol, and further includes isophthalic acid, phthalic acid and naphthalene. Dicarboxylic acids such as -2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4'-dicarboxylic acid, diphenoxyethanedicarboxylic acid, 5-sulfoisophthalic acid, and ester-forming derivatives thereof. Acid component and ethylene glycol, trimethylene glycol, pentamethylene glycol, hexamethylene glycol, neopentyl glycol, decamethylene glycol, 1,4-cyclohexanedimethanol, tricyclodecane dimethylol, xylylene glycol, bis(p-hydroxy) ) Diphenyl, bis(p-hydroxyphenyl)propane, 2,2-bis[4-(2-hydroxyethoxy)phenyl]propane, bis[4-(2-hydroxy)phenyl]sulfone, 1,1-bis[4 A polyester derived from a diol component such as -(2-hydroxyethoxy)phenyl]cyclohexane, 4,4'-dihydroxy-p-terphenyl, 4,4'-dihydroxy-p-quarterphenyl, or a polyester derived therefrom. It may be a copolyester in which two or more dicarboxylic acid components and diol components are used in combination.

Examples of the polymer forming the soft segment of the polyester-based thermoplastic elastomer (TPC) include a polymer selected from aliphatic polyether and aliphatic polyester.
Examples of the aliphatic polyether include poly(ethylene oxide) glycol, poly(propylene oxide) glycol, poly(tetramethylene oxide) glycol, poly(hexamethylene oxide) glycol, a copolymer of ethylene oxide and propylene oxide, and poly(propylene oxide). Examples thereof include ethylene oxide addition polymers of glycols and copolymers of ethylene oxide and tetrahydrofuran.
Examples of the aliphatic polyester include poly(ε-caprolactone), polyenanthlactone, polycaprylolactone, polybutylene adipate, and polyethylene adipate.
Among these aliphatic polyethers and aliphatic polyesters, poly(tetramethylene oxide) glycol, ethylene oxide addition polymer of poly(propylene oxide) glycol, and poly(ε-caprolactone) from the viewpoint of elastic properties of the obtained copolymer. ), polybutylene adipate, polyethylene adipate and the like are preferable.

The polyester-based thermoplastic elastomer can be synthesized by copolymerizing a polymer forming a hard segment and a polymer forming a soft segment by a known method. As the polyester-based thermoplastic elastomer, commercially available products can be used, for example, "Hytrel" series manufactured by Toray DuPont Co., Ltd. (for example, 3046, 5557, 5577, 6347, 4047, 4767, 4777). "Bellprene" series manufactured by Toyobo Co., Ltd. (P30B, P40B, P40H, P55B, P70B, P150B, P280B, P450B, P150M, S1001, S2001, S5001, S6001, S9001) and the like.

[Thermosetting resin]
Examples of the thermosetting resin include phenol resin, epoxy resin, melamine resin and urea resin.

In the resin composition, in addition to the resin material, rubber, various fillers (eg, silica, calcium carbonate, clay), antioxidants, oils, plasticizers, colorants, weathering agents, and reinforcing materials may be added, if desired. You may contain additives, such as.

An adhesive layer may be provided between the coating layer and the reinforcing member in order to further improve the adhesive performance between the coating layer and the reinforcing member of the reinforcing layer, and the coating layer may be formed by laminating a plurality of different materials. It may be the one. Here, for the adhesive layer, for example, a thermoplastic resin or a thermoplastic elastomer, a solvent-based adhesive, a water-based adhesive, a thermosetting resin, or the like can be used.

<Tire frame>
As described with reference to FIG. 1, the tire frame body (tire case) is annular and is made of a resin composition containing 50 to 100 mass% of a resin material.
The resin composition used for the tire skeleton may be the same as or different from the resin composition used for the coating layer of the reinforcing layer, but is the same in consideration of the difference in the adhesiveness and physical property values between the coating layer and the tire skeleton. It is preferable.
The thickness of the tire skeleton at the maximum width portion of the tire under no load is usually 0.5 to 2.5 mm, preferably 1 to 2 mm, and the tire skeleton is formed on the inner surface of the tire of the tire case mainly made of rubber. It is different from a resin inner liner that is usually provided and has a thickness of 100 μm or less.

In the resin composition that can be used for the tire frame, if the content ratio of the resin material is 50% by mass or more, the tire can be easily recycled. Here, from the viewpoint of ease of recycling, the resin composition that can be used for the tire frame body preferably contains 90 to 100% by mass of the resin material.

The resin composition that can be used for the tire frame body preferably contains at least one of a thermoplastic resin and a thermoplastic elastomer. By forming the tire skeleton body using a thermoplastic resin and/or a thermoplastic elastomer, recycling becomes easier, and in addition, the structure can be simplified and the tire can be made lighter than conventional rubber tires. can do.

As the resin composition that can be used for the tire frame, the thermoplastic resin or the thermoplastic elastomer described as the resin composition used for the coating layer of the reinforcing layer can be used.
Further, similarly, from the viewpoint of easily recycling the tire frame body, at least one of the thermoplastic resin and the thermoplastic elastomer contained in the resin composition is preferably a polyamide type, a polyester type, a polyolefin type or a polyurethane type. .. That is, the thermoplastic resin is preferably a polyamide-based thermoplastic resin, a polyester-based thermoplastic resin, a polyolefin-based thermoplastic resin, or a polyurethane-based thermoplastic resin. The thermoplastic elastomer is preferably a polyamide-based thermoplastic elastomer (TPA), a polyester-based thermoplastic elastomer (TPS), a polyolefin-based thermoplastic elastomer (TPO), or a polyurethane-based thermoplastic elastomer (TPU).
Further, from the viewpoint of durability against strain input, a polyamide-based thermoplastic resin, a polyester-based thermoplastic resin, a polyurethane-based thermoplastic resin, a polyamide-based thermoplastic elastomer (TPA), a polyurethane-based thermoplastic elastomer (TPU), and a polyester-based thermoplastic resin. It is preferable to use at least one selected from the group consisting of thermoplastic elastomers (TPC).
In addition, the additives that can be added in addition to the resin material are the same as the resin composition used for the coating layer of the reinforcing layer.

The tire frame body using the resin composition can be manufactured according to the second embodiment of JP 2012-046030 A (Patent Document 1), and for example, a half body of the tire frame body is manufactured by injection molding, It can be produced by joining the halves to each other, and at the time of joining, it is preferable to press at a temperature equal to or higher than the melting point of the resin material in the resin composition used.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples.

[Examples 1 to 18 and Comparative Examples 1 to 4]
According to the second embodiment of JP 2012-046030 A (Patent Document 1), a polyamide thermoplastic elastomer (polyamide thermoplastic elastomer, Ube Industries, Ltd., trade name “UBESTA XPA9055X1”) is used as a resin material, A tire skeleton body (tire case) is manufactured by producing half skeletons of the tire by injection molding, facing each other, and pressing at a temperature equal to or higher than the melting point of the polyamide-based thermoplastic elastomer used for joining. did.
Next, a steel cord covered with a thermoplastic polyamide-based elastomer was spirally wound in the tire radial direction outside of the tire frame body in the circumferential direction of the tire to provide a reinforcing layer.
A carcass in which an adhesive is applied to the outer surface of the tire, and a gum chafer and side rubber prepared by a conventional method are coated with a carcass ply coating rubber composed of a rubber composition having a formulation shown in Tables 1 and 2. Layers were prepared, and tire molding was performed such that the layers were overlapped at the center of the reinforcing layers and arranged on the outer side in the tire radial direction of the reinforcing layers, like the carcass layer 40 shown in FIG. 1. Further, a rubber surface layer made of a rubber composition for tread rubber prepared by a conventional method was disposed on the tire radial outside of the carcass layer, and then vulcanized to prepare a tire (pneumatic tire).

The thickness of the manufactured tire frame body in the maximum width portion of the tire when no load was applied was 2 mm.
Further, the tire skeleton of the manufactured tire and the coating layer of the steel cord are made of a thermoplastic polyamide-based elastomer, and the proportion of the resin material is 100% by mass.

Further, the amount of organic acid in the rubber composition for carcass ply coating rubber, the loss tangent tan δ of the carcass ply coating rubber at 1% dynamic strain at 25° C., and the storage elastic modulus E′ at 1% dynamic strain at 25° C. Was measured by the following method.
Furthermore, the obtained tire was evaluated for high-speed durability (high-speed drum durability) by the following method.

(1) Measurement of amount of organic acid in rubber composition for carcass ply coating rubber The amount of organic acid in the rubber composition for carcass ply coating rubber was determined according to JIS K6237:2012. The results are shown in the "organic acid" column of the "blend" column of Tables 1 and 2.

(2) Measurement of tan δ and E′ A rubber sheet having a length of 50 mm, a width of 5 mm, and a thickness of 2 mm was prepared from a rubber obtained under the same vulcanization conditions as the produced tire using the rubber composition used for the carcass ply coating rubber. Cutting out, using a dynamic viscoelasticity measuring device manufactured by Ueshima Seisakusho Co., Ltd., under conditions of an initial load of 160 mg and a frequency of 52 Hz, a loss tangent tan δ at a dynamic strain of 1% at 25° C. and a dynamic strain of 1% at 25° C. The storage elastic modulus E'of was measured. The results are shown in the "tan δ" column and "E'" column of Tables 1 and 2.

(3) High-speed drum durability Each test tire was adjusted to an internal pressure of 300 kPa in a room at 25°C ± 2°C, left for 24 hours, and then the air pressure was readjusted, and a load of 400 kg was applied to the tire. Then, a drum having a diameter of about 3 m was run at a speed of 100 km/h at a speed of 10 km every 10 minutes. The high speed durability of the tire was evaluated according to the following evaluation criteria from the magnitude of the index value, with the distance when the tire failed as the durability distance and the value of Example 1 as 100.
(Evaluation criteria)
⊚: Index is 100 or more ○: Index is 95 or more and less than 100 Δ: Index is 90 or more and less than 95 ×: Index is less than 90

Details of the blending components in Tables 1 and 2 are as follows.
[Rubber component]
NR: Natural rubber, made in Indonesia, trade name "SIR20"
SBR: Styrene-butadiene copolymer rubber, manufactured by JSR Corporation, trade name "#1500"
Liq SBR: Liquid SBR (Liq SBR) was obtained by the following procedure.
In a pressure-resistant glass container of 800 mL that had been dried and purged with nitrogen, 300 g of cyclohexane, 40 g of 1,3-butadiene, 13 g of styrene and 23 mmol of ditetrahydrofurylpropane were added, and further 23 mmol of n-butyllithium was added, and then at 50° C. for 2 hours. A polymerization reaction was performed to obtain a liquid SBR (Liq-SBR) having active terminals. The polymerization conversion rate at this time was almost 100%.

〔Carbon black〕
CB1 GPF: Asahi Carbon Co., Ltd., trade name "#55 (GPF)"
CB2 HAF: Asahi Carbon Co., Ltd., trade name "#70 (HAF)"

[Various ingredients]
Organic acid: Stearic acid vulcanization accelerator: N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, manufactured by Ouchi Shinko Chemical Industry Co., Ltd., trade name "Nocrac 6C"
Incidentally, the organic acid, using stearic acid as a blending component, the amount of the "organic acid" column in the table, the amount of all organic acids in the rubber composition for carcass ply coating rubber including the amount of organic acids contained in natural rubber etc. Indicates the amount of acid.

From Table 1 and Table 2, a coating layer of the reinforcing member of the reinforcing layer and the tire frame body are formed of a resin composition (100% by mass of the resin material), and a rubber surface layer including a tread rubber, a side rubber, and a gum chafer, and The tire of the example having a carcass layer in which tan δ is 0.05 to 0.2 and E′ is 2 to 10 MPa and the carcass ply is coated with the carcass ply coating rubber is more than the tire of the comparative example. It can be seen that high-speed durability is high.

According to the present invention, it is possible to provide a tire having excellent high-speed durability while using a resin material.

10 Tire Skeleton Body 11 Bead Part 12 Side Part 13 Crown Part 14 Bead Core 20 Reinforcing Layer 21 Reinforcing Member 22 Covering Layer 30 Rubber Surface Layer 32 Tread Rubber 34 Side Rubber 36 Gum Chafer 40 Carcass Layer

Claims (7)

An annular tire frame body made of a resin composition containing 50 to 100% by mass of a resin material;
A carcass layer, which is outside in the tire radial direction of the tire frame, includes one or more carcass plies that extend in a toroidal shape between a pair of bead cores, and a carcass ply coating rubber that covers the carcass plies.
A tire radial direction outer side of the tire frame body, a reinforcing layer provided on the tire radial direction outer side or inner side of the carcass layer,
A rubber surface layer that is provided on the tire radial direction outer side of the reinforcing layer and includes at least a tread rubber,
Equipped with
The reinforcing layer is formed by coating a reinforcing member with a resin composition containing a resin material in an amount of 50 to 100% by mass,
The carcass ply coating rubber has an initial load of 160 mg, a frequency of 52 Hz, and a loss tangent tan δ at a dynamic strain of 1% at 25° C. of 0.05 to 0.2, and an initial load of 160 mg, a frequency of 52 Hz, and a dynamic temperature of 25° C. A tire having a storage elastic modulus E′ of 2 to 10 MPa at a strain of 1%. The carcass ply coating rubber has a loss tangent tan δ of 0.05 to 0.13 at an initial load of 160 mg, a frequency of 52 Hz, and a dynamic strain of 1% at 25° C. of 0.05 to 0.13, and an initial load of 160 mg, a frequency of 52 Hz, and a dynamic temperature of 25° C. The tire according to claim 1, wherein the storage elastic modulus E′ at a strain of 1% is 4 to 8 MPa. The carcass ply coating rubber is composed of a rubber composition for carcass ply coating rubber, and the rubber composition for carcass ply coating rubber contains 0.1 to 5.0 parts by mass of an organic acid based on 100 parts by mass of the rubber component. The tire according to claim 1 or 2, further comprising: The carcass ply coating rubber comprises a rubber composition for carcass ply coating rubber, and the rubber composition for carcass ply coating rubber is vulcanized in an amount of 0.1 to 5.5 parts by mass with respect to 100 parts by mass of the rubber component. The tire according to any one of claims 1 to 3, which contains an accelerator. The tire according to any one of claims 1 to 4, wherein the reinforcing member is wound in a tire circumferential direction. The tire according to any one of claims 1 to 5, wherein the resin composition used for at least one of the reinforcing layer and the tire frame body contains at least one of a thermoplastic resin and a thermoplastic elastomer. The tire according to claim 6, wherein at least one of the thermoplastic resin and the thermoplastic elastomer is a polyamide system, a polyester system, a polyolefin system, or a polyurethane system.